APA استشهاد

Verma R. K. & Verma, G. (1989). Research methodology. Common Wealth Publishers.

استشهاد بنمط شيكاغو

Verma R. K. و Gopal Verma. Research Methodology. New Delhi: Common Wealth Publishers, 1989.

MLA استشهاد

Verma R. K. و Gopal Verma. Research Methodology. Common Wealth Publishers, 1989.